is it weird for someone to have two computers?

When I went back to school I wanted to get two computers. My major was graphic design which consisted of major computer space and excellent graphics. I wanted to use one for work/school related stuff and one for personal. (One Mac and one PC.)Someone was helping me buy the computer and said she couldn't justify buying 2 computers which I understood. Well they helped me with the one computer for school/work (which was a Mac), but failed to put Apple Care on it. A few years later juice was spilled in my computer. It was out of regular warranty and it wasn't covered under Apple Care because I didn't have it. The computer was completely destroyed and now I have to get a new one. So now because of work and research I need another now. Macs cost a pretty penny so I would either have to wait and save up or put it on my credit card _ but my c.f. is full). I need a computer ASAP so I considered getting a PC now because it's cheaper and at least I could do my Reserch and then when I have the funds I could get a Mac. My sister said I was crazy, it didn't make sense and it was a waste if money. Does having two computers make sense or is it too much? Had I had both before, my mac wouldn't have been destroyed. What are your thoughts?