I have recently had some brides say that they were not interested in a Photobooth because it takes attention away from them on their day. Another bride stated she wanted people to focus on dancing.
Photobooths can be fun and a creator of momentos at your reception. It might even help people loosen up a bit for the dancefloor or entertain those who are not big dancers.
Bottom line, if it fits your budget, you have thought it would be fun and my opinion, if you have over 200 guests...then go for it!