Worst case, you can buy 9000 credits, for $10, which is a reasonably competitive rate-- and they rollover-- so there's not a lot of potential downside.
Yesterday was so dry I almost gave up after 200 credits. I pushed through to 500 but it was far more work than it was worth.
Today the ads flowed all day, with just a few dry spells. I linked a device to an account for a girl at church who doesn't have wifi and I figured out how to swipe two devices at the same time, with one hand.
I earned 5000 on mine and 6000 on hers, while watching Hallmark movies. Woo hoo!
So this happened...
WOW The ladies in Church must really love you! 
Dry day today. Not much to talk about in the cellnuvo world either! Has anyone been getting any new ads - all mine have been the old 30 silver ones and the then short hampton inn, flonase and olay 10 silver ones lately. Seems like everything has gone back to what it was with not many new ads.
Someone posted that CellNUVO C/S is not responding? Chat shows unavailable today and when you call it is forwarded to voice mail?
Chat is always unavailable as is the phone line. They do respond to emails within a couple of days usually.
I had one streak, today, where I got the anti tobacco ad, repeatedly, after one swipe. I rode the wave for a quick 500 before things slowed up.
I have FIOS ads repeatedly right now.
To top it all off I thought I'd try a survey and got 15 minutes through and then it said I was disqualified. Nice. Take all my data and give me nothing.
I was able to knock out 1000 on my phone and another 1000 on a friend's phone, today.
Speaking of earning points on another device, has anyone tried to use Bluestacks?
Chelle, Looks like you've figured the best way to get credits, plus you're helping some friends out. I had to use two hands to swipe two phones, not sure how you did it with one hand, but you will probably pass us all up soon while doing some good deeds for some people who need it. Keep up the good work.
Chelle, two devices in the same time and watching TV, amazing!
It's not easy being this good. 
Moms are really good at multitasking.
Great day today, the silver was flowing big time -- had to keep emptying buckets and refilling, it was cazy lol.
I'm earning lots of points, but for some strange reason I have a strong desire to join the Coast Guard......
New app seems to serve up an ad on every swipe but the values have gone down again. I'm seeing 4, 6 and 9 credit ads.
Fractional gold is gone. Only round numbers, now. Gives a better look.
Edit: MetroPCS video is only 3 credits.
Edit: App locks up every few ads. Don't upgrade.
Edit: MetroPCS ad is a ripoff. Would have been 30 credits, before, and is only 3 now. And it's the most frequent one. Makes earning credits no longer worth it.
Edit: 6 credits for a 30 second ad that uses 40 credits worth of data. CellNUVO needs to figure out a way to cache the ads on the phone to minimize burn rate.
Actually the old style ads including metropcs still credit 30 silver BUT there is a new style metropcs ad that is titled "take a quick break..." and thanks you at the end for using cellnuvo ie this is a thank you reward now too. Credits 3 silver which is a rip off. I just hit back and search again.
The new app is snappier and serves more ads. I like it generally. If they continue to serve enough 30 silver ads I would be happy with it. The take a break ad needs to be 10 at least though and as you say it is the most frequent.
The old offer list is back with app and game downloads too. Nothing in the store .
Do note the new app is v2.09b ie part of the beta program. App doesn't lock for me.
I like the static ads that credit 3 silver but you can cross them away after 1 second. Better to have those than swiping over and over and getting nothing. Filler ads are nice as long as the big 30 silver ones flow a plenty
I just put two phones side by side and swiped together. I earned 200 silver on version 2.00 in the same time I earned 28 silver on 2.09b.
They both served approximately the same number of ads.