As we all know, there are differences in prices and trends between exchanges. Many people will ask if it is feasible or not. You have to try it before you know it.
Those people that are asking are unsure of what they are about to do and that's normal. I saw many times that someone who's asking if it's fine to sell at that time for that coin and as well as buying it.
It is okay that they're asking first before trying but you're right, they have to do it on their own to know what shall be the outcome of their trades. If it's profitable then that's good for them and if it's not, they just have to learn the lesson from it.