The first CPU I ever sanded was a $40 celeron, used purely for a learning vehicle because the second CPU I ever lapped was my $1500 QX6700.
Both survived the lapping. However, the QX6700 did not survive the effects of prolonged and repeated exposure to water/condensation that came with 2+ years of near 24/7 vaporphase cooling. The chip died and I moved on to a 2600K.
Personally I say just do it. YOLO. Am willing to bet you will spend far more than $1K on wine/alcohol and fine dining with steaks and seafood over the next year or two than you spend on your processors. At least I hope you do, I intend to