> If you lose in the lottery, they'll refund the fees. One caveat to bear in mind is that applying for this visa shows intent, which may disqualify you for visas in the future which aren't dual intent, such as the B-1 & B-2 visitor visas.

(IANAL, but:) This is very wrong on at least two counts: there is no fee for enrolling in the lottery and if anyone charges for it, they are a scammer and you should enroll directly on dvlottery.state.gov site (as explicitly stated in its FAQ). Also, simply signing up for lottery is generally not sufficient ground for immigration intent (though being conservative doesn't hurt).