Bit of a dick move; I have no problem letting the second squad compete in the varsity meet for the win. It looked liek a good competition for them (they won with depth and without a top three runner). Obviously this meet was below their top athletes. So why do it? I have never understood the workout through the meet mentality.
If you need to workout, then workout...just stay at home and tempo, do mile repeats or what ever on Friday (before the JV team departs) and then go easy on Saturday before a long run on Sunday. They would probably get a better workout in this way, and likely would have a better long run. Additionally, they would likely save some money on hotels, meals etc. (no idea where Lowell and Dartmouth are, maybe no hotels involved, but still).