Feel like borrowing to buy BTC

Hi all,

Around Nov 22, I was desperate to borrow money to buy myself at least 1 or 2 BTC, I didn't and I regretted it.

I now start to have the same urge again, I really just want to do it. I feel like a 100/200K loan to get my self 2/4 pieces, hold for a few years, sell and repay.

Honestly, what can go wrong? BTC is not going to 0, I see the risk as it staying around 40/50 level for a little longer than I expect. Why am I wrong (if I am)? Why shouldn't I do it?

EDIT: Thanks for all your points, FYI, I can easily manage to get interest free loans for like 2-5 years. A lot of you have pointed out that I would need a backup plan to repay the loan, I guess I should save up now from work for that time period at least as a hedge against loses in case BTC goes down in value. Thanks for all your advice.