Serious guy? Don't ask simple questions like this because you can easily get your answers by doing an internet search. If you really want to learn there are many guides out there, or just in Bitcoin section in this forum, there are many useful guides there.
Imho it is not a simple question, but should be the key question for all potential buyers: what will be the miners paid with, when there is left nothing to mine?
With small fees in not an adequate answer, as mining is very ressource-costly job and will be even more so, as chains grow longer and longer. So, what are yhe miners going to be paid with?