Rent out tennis ball machines for extra revenue

Generating more revenue is always good! I have found that many tennis players that might be demoing a racket may want to take it out on the court sooner than later. By offering a portable ball machine such as the tennistutor or perhaps the new lobster machines . It might take some time to pay for itself but the added bonus might get some players to demo that racket quicker and therefore have a potential racket sale waiting.