L2 Adrenaline is really good I am using it and can confirm it is not a scam, bot works great and the forum and people are very supportive with instructions and development of new features, scripts.
$20 yes it might seem a lot for some, however if you consider the fact that you can easily make that back thru selling adena, chars etc. in about a week that leaves you 3 weeks of either just pure fun with it or even earning potential.
Google L2 Adrenaline check out the forum and see how many people is already using it and writing scripts for it, it is definitely not a scam and well worth that $20.
And here is $20 in Russia 700 rubles, but if you check out Russian forum it says there will be increased in price to 1100-1400 rubles which can make it even more expensive there.