How to avoid scam when buying sites on digitalpoint?

And there are also scams on freelancer sites, so you don't hire anyone to do job for you?

That's stupid advice. There are some amazing opportunities available on forums like DP, mainly because most people avoid it as they can't be bothered to do proper due diligence.

Whilst there are scammers on DP, they are on all forums. I've seen plenty of crap sold here in the WSO section with fake income claims too.

Some things you should do to verify claims:

Get guest access to Google Analytics. If they don't have Google Analytics, ask for screenshots of Awstats and then screenshare via Skype/Teamview to verify they are accurate.

Same goes for income stats - use screensharing to verify. If they have Adsense, check the URL channels to make sure it all adds up.

Do not assume because someone has a high post count, itrader or paid membership that they are legit. Accounts get hacked all the time and their paid membership is only something like $20, so hardly going to stop a scammer if they can potentially make $500.

Pay via Escrow. Set a reasonable inspection period to ensure you can verify all claims before releasing funds.

Don't cut corners, and you'll be fine. You will have to take some time sifting through scammers and bad opportunities, but there are plenty of great deals to be had if you stick at it.