To safe you the headache my advice is you need to ask yourself if you are in for long term investment or short term ,to make profit from some altcoins you have to hold them longer than you expected but if you don't want that just go for top 10 altcoins ,they are indeed very good that's why they make it to top10

Buying cheap coins or tokens doesn't mean they will give better profit on the long run ,you have to make sure the project is very good and the teams are working ,tokens like pundix hologen and clear token are still very cheap

In the first place bitcoin was never programmed for fast instant transaction and its still faster than most online payments outside of crypto realm if this is your point that bitcoin won't be used for long term you are so wrong friend

That's exactly what you will earn will CPU mining because the mining difficulty is very high now ,GPU tend to be a little better