Some thoughts about seed boxes though:
1st: why pay a monthly fee for a seed box when you have a decent (1 MBit/s[nb]even a speed of of 512 KBit/2 = 64 KByte/s is enough to get permission to upload 2 new torrents at the same time[/nb] ) upload speed?
2nd: what to do with your downloaded data files? I currently have more than 4 TB of data available for seeding, a seed box with such storage capacity is waaaayyyy more expensive than the starting 12 EUR/month, and you need at least a capacity of several GB to be able to seed torrents over a longer time.
3rd: The use of seed boxes may prove very unfair towards other users with limited upload speed because the BitTorrent protocol is designed to prefer peers with a better upload spee so using a seed box may result in unfair behaviouir towrds (so called) slow-liners.
Bottom line: I don't like seed boxes very much (unless you carefully control your ratio management and don't try to over seed torrents) - but because we don't forbid seed boxes (and won't do so for the overview-able future) I can only recommend: be careful with using a seed box.
