Specifically as a spotter, in a regular skirmish, I'd say no. Especially if you're the flanking, stealthy type of sniper - one person is harder for the enemy to spot than two.
As a back up gunner for when people get too close to you to snipe, maybe. They be able to help cover your retreat to a better sniping distance, then you'd be able to cover theirs while they regroup with you.
In a MilSim, they'd probably be more useful, you may need to hit certain targets, whereas in a regular skirmish you generally don't. They'd be able to point out high value targets for you. But, you run into the same problem again - one person is harder for the enemy to spot than two.
Overall, say no, but when I snipe, I tend to be with a group of 6 or so people, 1-2 snipers, and 4-5 AEGs, maybe a support gunner if there's one available.