Que Ram’s spidey-senses.
Hey just trying to help. :3
At least everyone else will finally be able to donate money, something I do not have.
If you really want to spend your money, feel free to send it to me. PM me for my paypal. 
quoting from FAQ:
HOW MUCH WILL BLACK MESA COST: This is a FREE modification, and as such there will be no charge to download. Many people have voiced that they would be willing to pay for work of such quality, however, the legal ramifications of charging for making a mod are fairly clear. To put it short, it won’t happen.
Please use the search function/read the FAQ next time.