For example, let's say I wanted to take an expensive vacation. I would fly to Europe (1st class, of course), stay in nice hotels, and basically live it up. I would mark this down as a "recruiting expense", or "customer acquisition cost". If the investor cared to drill down to this level, all they would see is a $75,000 trip to Europe for recruiting. They wouldn't know how many people went, or how successful it was. $75k is nothing next to an engineer's salary, and a recruiter would take a fee on the same order of magnitude, so I doubt they would bat an eye, but a 20-something founder could take a pretty sweet vacay for $75k.
Want a new motorcycle? Its for product testing, of course. New $80k Tesla? We're exploring how our tech could be expanded to used in cars, not just with motorcycles. Hookers and blow? Team building.