YA bans on different levels. It first bans based on users. If you're bob1234, and you post
www.mysite.com too many times, it'll -999 you maybe once, then if you do it again within usually a 48-96 hour period, then you're banned. I find that if you post a link more than 30-40% of your links in a session, you're probably gonna get banned.
YA usually thrown up bans in this order: ban based on website address, then based on site IP, then based on user IP. They can all be gotten around. The key is patience in your posting. The days of posting the same link in 10 continuous posts are over.
I did it manually for about a year, then decided to stop and do other things, but that was after tearing through about 10 different profiles over that period. Was it worth it? Yeah. I still make $20-$30 a day from that traffic, even now.
*********** isn't worth it, in my opinion. Those accounts seem to get banned as well. And I couldn't justify leaving my machine on 24-7 just to get a few madlibbed posts a day. I dropped it after two weeks of experimenting.
I still think manual is the way to go. Just buy some proxies, make sure you clear out your cookies everytime you go in, and post away. If you don't want to do that, then dialup is still pretty effective as well. No IPs to track there. My two cents.
My old YA book is floating around here as a free download somewhere as well. Look it up.