Yes, it is strange that Neteller, quite often being even too careful about money transfers, in this case just let it go without noticing. They recently phoned me enquiring about a transfer of $250 that I was supposed to get, clarifying the reason for the payment and asking me all little details of the deal I had been paid for.
As to the $5,000 media deal you were promised by the same company, I think you can just forget about it and move forward. I hope that at least the site you purchased has a good potential and you will get your money back sooner or later.