Any flip is worth it if you buy it right.
Car washing isn't for everyone but you have to determine which strategy is best for you based on your personal goals and objective regardless of the asset class. If you can buy a car wash like you mentioned above that has a true market value as you indicated above then yeah making $300K to me would a nice deal. However, is the $375K a pipedream or a realistic value for the car wash that would be a win/win for buyer and seller which would lead to closing a
transaction.
Car washes are specific use real estate properties that offer annuity like returns. So how much profit are you wanting to forgo future cash flow payments (that will cost you or someone work)???
A wash I sold I knew I would sell it because the department of transportation was all around me. They owned the land easy, north, and west of me. To the south was the road so I knew sooner or later they would want the property. I over paid for the location based on current cash flow but I knew I could operate it better and I did. This better performing cash flow gave me leverage to negotiate a better price that ultimately would be better than any wanna be car was owner would offer me so I let it go after holding it for 3 yrs.