It's all reletive at the end of the day

R30k would be alot of money for someone earning R15k per month, but a drop in the bucket for someone earning R300k per month. That being said, it's one thing to tell someone it might be inefficient spending that kind of money on a box, but it's definately not neccessary for some of the name calling that's been going on. "Stupid" would have been going out and dropping a wad of cash on a machine without doing a bit of research first, which the OP obviously isn't doing.
If you add up some of the suggested costs such as SSD drives, proper UPS and high-end GFX cards, R30k doesn't seem all that much all of a sudden.
One thing I would suggest is not going the SLI route seeing as lots of games don't even support it and would benefit more from a higher-end single PCB solution, which can always be upgraded later with the difference.