1) Interesting you asked, I had been using them on and off them for years. I attempted to get information on a few newer sports books I was interested in over the last year or so.
My answer is... NO!!, Not really, they "sold out". From my understanding, they are now only dealing with government-regulated sports books as an "affiliate" site. I suspect they sold out to a company that promotes the Big Boys like Draft Kings. They used to help solve payment issues with offshore books, but not anymore. There's now strict moderation. Long-time posters have been censored and banned. It's like Trip Advisor... if you say anything negative about a destination the don't like it and ir allow it. Not sure exactly how strict SBR is. You can see some older information on offshore books, but It doesn't seem to be search-friendly.
2)Football season seems to bring out bigger, better, and more frequent offers, but it is actually a year-round gig. I get calls 2 times a week with bonus offers. Emails daylily. I don't even have accounts at all the solid places.
3) I have only ever been banned from a few regulated books. I really don't know how often the offshore joints ban sharp bettors. I know a few guys who do well using sharp bets, bonuses, and boosts who consistently make money, however, I assume they have so many accounts going and B&B casino available that offsetting and hedging +EV opportunities come up that give the appearance of donkey betting.
Some places will slow down your bonus eligibility for a while if you're winning and cashing out. They may ask you to deposit equivalent to your last cash out and only anything above that is eligible for a bonus. Wait a while and eventually, they disregard that. I also have a few tricks up my sleeves to get them to wave that. There's a good chance I might get tagged this season since I ramped up.
My max bet has been 3k (I have to get authorized for anything over 1k) They adjusted the line first as well, but I didn't care, I needed the bet. I try not to let my accounts get too high if possible, I'll give up some vig in an attempt to avoid that, but you can't control it perfectly.
4) I'm certainly no sports betting odds or math expert. I quickly look at something and see its value and potential, I figure out how one can best exploit the situation I can see the bigger potential and big picture. I know what needs to be done, and how to do it. I haven't any doubt there are guys that have it figured out fairly well but I bet they are missing some of the potential.
However, I'm not very good at finding value bets, and I'm not good at knowing stuff like... x number of legs on a parlay will get you closest to your EV if you have -150 or + this or that, therefore you will achieve exactly 75% of the free bet value. Intuitively I know this stuff and have a good educated guess. knowing that stuff is important, and knowing you don't know something... IS the most important because, I know what I need to know and figure out, and who knows what the fuck they are doing.
There are a few people I have met on the forums who know all the odds, math, stats, and value bets like some Rainman-like ability shit. I'm absolutely amazed at what and how often and quickly they find incredible value bets on crazy complicated stuff. Holy fuck, that's free money!!
Me, I'm thinking... but if you just add in XYZ, it's worth so much more.
In closing, Red is so very wrong about the huge potential of pure +EV sports value betting(not even bonus whoring) and this isn't based on what I think I see firsthand, I have been involved. And I only know a few of the people doing it and making a good living. There's no doubt some unknown big boys crushing it.
I am but a barracouta in an ocean filled with great white sharks.