One idea behind this contract is you're 99% (if not 100%) sure the domain
will
sell. Otherwise, why bother?
Needless to say, this isn't for everyone.
If Moniker used the same contract discussed here in, say, any of their recent
auctions below:
http://marketplacepro.moniker.com/auction/index.html
Then there's one answer.
While I'm not entirely sure of the rationale behind the 2-year thing, it might be
similar to, say, some employees' contracts having a 1 (or 2?) year ban working
for a competitor after resigning or being fired. Just guessing, though.