No idea on UploadPay.
Sharecash VS Adscendmedia is a trade off.
Sharecash takes a considerable portion of your earnings but, despite they do not nominally allow copyright or illegal content, in the end they are pretty lenient with those (they are just
very strict with adult content).
With Adscendmedia you potentially can earn more, as you have full control of the offers, of the appearance of the gateway, you can promote single offers etc... so all looks more professional, but they do not accept anything that is even remotely illegal or copyrighted.
For example, they do not allow torrent invites as you can download pirated software with torrents.
I had long discussion with my AM as this does not make any sense to me.
Following this principle, Supermarkets may not sell kitchen knives as you can stab a person with a knife!
You normally have to be very careful with Adscendmedia.
Now that they have been sued by Facebook you must be EXTRA careful!
With Sharecash you earn less in terms of single downloads, but the things you can promote are almost endless so it all depends on what you are promoting.
Blanking referral with Adscendmedia is a good idea just if
- you have other legal sources of leads with visible referral, so they will not get too suspicious
- you are a very experienced IM, that can show there is a specific reason why you blank your referral
In fact... I am not doing it!
Also, don't forget that Jeremy of Adscendmedia is a member here and is technically very knowledgeable, so he knows all the tricks.