Honestly no. I will not let my bitcoin will spend in lottery or something like gambling. It is a waste of money or bitcoin. I will only spend my bitcoin in case of emergency or even if there is an good offer or opportunity of another investment. I value my bitcoin a lot because it is for my future so I do want to use it in lottery games or gambling that there is a very small chance of winning.
Actually there is nothing wrong with buying a lottery with bitcoin, yet you will not use all of your bitcoin to buy it. Everyone who gambles here must have used some of their bitcoin on gambling sites, because indeed the average bitcoin-based gambling site is at stake.
No, I will not buy if I won the lottery people where I bought online can easily trace me as their winner, it's better that you buy your own ticket online because your privacy is safe, there are people here that offer people for their service and that is buying a ticket for them for a small fee, but what if they record your ticket, they will know exactly that you've won the jackpot.
True, it's very risky to buy tickets through third parties. Sometimes we don't know how the third party recorded all the tickets we bought and manipulated them as if they were new.