Its really simple.. You think they will let you use up something that costs them $50,000 for a $249 membership? Although I highly doubt that you can upload 10TB there. But I would strongly suggest you only use single large files and not split ones because they have 25% failures and dont forget to check the file sizes as well. They also removed one of the functions which gave you the server name in their tools section which you could use to check if the file was available and then using a downloader to check file sizes.. Other wise you will only know the file is offline when you actually go to download it and start downloading which is much more time consuming.

Also once you start to get deletions its better to not ask them for any money since that usually gets your account deleted with the reply that you can just sign up again for a new account and this time try not to use other peoples files......

For most users there are not many good options. All of them have some problems and weird restrictions. Filsonic changed the way many other hosts operated, not sure what their game was because they would not have made any money over time the way they operated. But with them gone no one is there to keep the other hosts honest. Also payouts have dropped drastically now to less than a quarter of what it was before. You would think when some major hosts go down, payouts would go up a lot at other hosts from people looking at new sites.

If you are willing to put some real work into it and not expecting much of a payout, I think FF is great tool to use. All the problems mentioned does mean keeping constant tabs and checking often and not over abusing the system. Filesonic's firefox plugin tool about copying the internet to your personal account and getting a pay check every week will not work here.