PTC - Can be good for advertising

You really arent going to make a lot with PTC, unless you are a good promoter and have a huge downline.

They are an untapped market for advertising.

There is no profit sharing when you trade your earnings in for advertising. So you get you full amount earned.

I started doing this with my earnings as it is more productive for me.

Some sites do have minimuns you have to earn to trade in, with some being higher than cash out. You will have to check your terms on each site to see what offer.