I don't have enough data on acc scams to put the proper thought that I would like into restrictions , but ill but some stuff up anyway.
100 posts does not do enough but raising the restriction hinders those who have intentions of being legit too greatly, but in it's current state just an annoying hurdle in the way of scammers. It is not hard to get 100 post count .
http://osbot.org/forum/index.php?app=forums&module=extras§ion=stats
And tbh I don't even think post count should be visbile to regular users. It puts too much of a label on users who try to use it as a form of trust. It isn't. Which is why I don't think we should rely on 100 posts. Also we get way too many spammers who thinks that each post grows their cock and balls
People can easily cheat or afk their time online. I am currently the 3rd most active in this catagory a good chunk of it is afk.
Putting a cap on to what people can sell accounts for (i.e 10 feedback can sell accs worth 10m 20 fb 20m) only hinders those who are legit. People who scam do not care for these things and will sell super accounts for cheap for a quick scam.
The only thing I can think of is that people just need to make better decisions on who to trust. The majority of account scams come from new users with no feedback. This doesn't just go for OSBot but for this section of the market worldwide across all forums and games. Especially RuneScape because the way the recovery system works, original owners almost always wins and a middleman won't change that fact. This isn't to say that users with high feedback won't scam you for an account but beyond a certain point of feedback the scam rate drastically decreases. They might cost more but that's what you pay for.