Another reason you wouldn't want to put $50 on these types of bets, is because they are longshots (When I said they were not hard to win, I meant they are not IMPOSSIBLE to win....they are hard for sure, but considering the amount of dogs that win in the NBA on any given night, they are certainly profitable over the long run. I select certain dogs each night in a parlay, based on my own plays, and usually do not contradict each other. This is the best way I've found to win. That is how I hit the $90k for $5 bet. This is more like a lottery system, since it should be used daily, with a very small bet, and just hope that one of the days all of your dogs will hit.
You can always use multiple casinos to get around the limits, but I just think it would be crazy to bet $50 on a huge underdog parlay. I am going to calculate the payout of the 7 teams you posted for $50....Ok according to sportsbet online calculator, it says it would of paid out $280,000.00 for a $50.00 bet.
So, that is a good amount of money. I wouldn't want too much money riding on any one parlay...just because...you know, Vegas getting greedy and all that.