I like the basic principle of aggregating micropayments, but I think TipJoy going to be very limited until people can actually get money out (which of course means that TipJoy has to deal with the regulatory issues). So far they've accumulated $1531.54 in tips (assuming their website is up to date), which means that their 3% cut adds up to a grand total of $45.95... which isn't going to make anyone rich in a hurry.
Can TipJoy get big enough fast enough?
Well, that changes things. :-)
You can give far more than $0.10. That is just the default. It is really simple to give up to $10, and we might raise or remove that limit.
Also, we earn interest on money in our system. That makes the earnings closer to 6%. But we don't take a cut per tip, only on cash-out. This means that if A tips B who then tips C, each of those tips is overhead free. If C cashes out, we take a cut. The potential for a zero overhead transaction system is huge.
But that's not a really good comparison especially if Tipjoy is dealing directly in money while google was search. Having said that, maybe Tipjoy is onto something because the last micro-payment startup to do something interesting was paypal which started 10 years ago.