Ummm... crash, aren't there two different types of memory in use?
The NVRAM which holds the bios code ... this could be destroyed by flashing the bios more than a dozen or so times.
The battery backed CMOS RAM ... Where you're bios settings and ESCD parameters are stored.
Yes, repeated flashing can destroy the NVRAM.
But I wouldn't think, at least on newer boards, booting too often is going to hurt anything.
---><font color=green>It ain't better if it don't work</font color=green><---