How can I find if an ad is self sponsored?

Sometimes a site may be unsustainable, even if the advertising rates are greater than the amount of money site is paying to its members. If you have a look at the "surf ads" page and find that self sponsored ads are the majority of ads, or even worse all ads, then site is unsustainable. Sites paying $0.01/click (and usually $0.005/ref click) is difficult to survive even if they have and less than 4 self sponsored ads. Example is buxout.com: Four self sponsored ads per day, but site closed after ~6 months.

Example: bux.to
Site pays $20 per 1000 clicks and charges $19.10/1000 clicks. You'll say: "site loses only $0.90, seems to be ok (although it is not, site still loses money)". But if you have a look at the surf ads page, you'll see that there are more than 8 self sponsored ads. It is very unsustainable, that's why sells only bot referrals and has 8+ months payment delays.

Usually, self sponsored ads are other GPT (Get Paid To) sites with the ref link of the owner. If you see 4-5 ads with the same ref link (and also a huge number of total clicks), then all these ads are self sponsored. Also you can check the source code of the ad page: If you are using Mozilla Firefox hit ctrl+u. Scroll down in the new window which will open and you'll see the (real) link of the ad.

Example 1: 07bux.net
When site was up with bux_to_clone script, in the surf ads page had 10-15 ads. All of them were self sponsored. And most of them were other PTCs, with the ref link 07bux/bux07 or something like that. It is obvious that these ads were self sponsored. Site returned with new script (gen2) and erased all members' past earnings. Now 07bux is dead.

Example 2: bux.to
Site has this ad (for example): $3,456/daily. Open it and hit ctrl+u (firefox only). You'll see that the real link is: http://bux.to/sponsored/djkassassin. This ad is self sponsored. You can do the same thing with all ads.