You asked our opinion on the frontpage, that's why I registered, only to find out the topic has been locked :shock: Anyhow here is my opinion. Yes I am willing to pay $30 for this program if I could run it on Linux. That is because of the fact that Linux doesn't have any good binary leecher.
If I were a Windows user I would deem it to much and go for newsleecher or grabit instead. I hope this answers your question.