Hi Enam,
Your questions are answered below, but there is a larger issue here. Buying 50 domains to redirect for SEO value will not hurt you, but it will also not help you in the slightest. None of those domains have any juice to give, and they aren't doing anything for you, good or bad. There are reasons to do this sort of thing (branding), but not for SEO. Also, PLEASE SEE ANSWER "C" BELOW.
A. No.
B. No.
C. Location forwarding, for the love of all that is holy. Right now you are masking your website with 50 different domains.