That item which was sold on ebay, it did not look like you have shell out additional $$$$ for support. The seller did compare it directly to the same license you would get if you get the item from RIM for more then 3000$ (which includes one TS incident).

Sounds strange but not impossible. The risk is yours, especially if you do not live in the same country as the seller.

I dont think (but this is pure speculation) that there will be an offer soon like a BPS 5.0. If it is true, that BPS4 will still be offered for free, but wont be supported /no patches, then, it can take even longer - no patches means 0 cost for RIM. The only maintenance they have to do is for V5 and Enterprise V4.