It is ok to acquire diff gears, esp lenses, mainly to explore the possible photographic styles they can achieve. It is fun, which hobby is all about - to have fun.
With the B&S section in CS, we are given a cheaper alternative to explore diff gears at a much much lower price than from retail.
However, as we grow in photography, most of us will realise our main interest, be it landscape, photo-journalism or marco. By then, I would think that our arsenal will be much limited to what we photograph. Any not used lenses or accessories will be sold off.