So after sticking with Happy Street for a week or so, I definitely think it picks up quite a bit and the pay wall seems to lower as well. I'm really enjoying the game now, I definitely feel like the number of activities you can perform when you check in increases to the point that you've always got something to check, if you so choose. I seem to be waiting about 2 days at the most between expansions at the moment, but I've got a steady supply of premium currency coming in without buying it.
I convinced a few friends to play and friended a bunch of people from forums/gamecenter (my s/n is Hawtpants if anyone wants to add me) so there's a few Flooz, I seem to have problems logging into Facebook on the droid version but there's Tapjoy for that. I'm playing 2 different versions of the game at the moment, but I wonder if cloud saving could let you transfer your data between ipad/droid and use tapjoy as a way to make some extra flooz.
After playing the Fortune Wheel you can figure out the pattern (there seem to be 2-3 different spin speeds) and get better at stopping the wheel, I seem to get a free flooz pretty often at the 2 slowest speeds. The hammer minigame doesn't offer flooz but you can easily max out your coins by stopping just before it hits the bell.
Lucky spin is always good for at least 1 (although I got 15 once on my phone) flooz a day but unfortunately, I seem to always be short on blue dye to make extra lucky spin tokens. That seems like a pretty good way to get extra flooz as well.
On top of that, if you're diligent about crafting random stuff you don't need, you seem to have the required items for Pepin's deals more often than not. I seem to get pretty lucky with flooz rewards for my excess apples and logs. I just wish he'd take my piles upon piles of bird poop!
Anyway, collecting the random items for crafting is really addicting, and hopefully they'll add more crafting recipes. I wish there were decorations you could add to personalize your village that didn't take up horizontal space, as well. One thing I really do like is all the random hidden things you find, like taxicabs you can stop at your village, carrying a rich traveler who will buy a ton of stuff, or a construction vehicle that will lower the build time of something you've got under construction.
The game definitely reminds me of animal crossing. I've been sending blue crystals to random people on my friend list, in the hope that I'll get a red or yellow crystal back. Sometimes I'll send random cakes and food, just for fun.
Anyway sorry for my mini-rant, I'm just really digging the game lately. I haven't bought any Flooz but I would definitely consider making a small purchase at some point to support the developers, but only if they raise the exchange rate. 5 bucks for 50 flooz isn't that great considering the price of the premium items.