Some of my favorite photographers, Simply Bloom, announce on their website "We will be in Paris these dates, Mexico these dates" etc. and then people book up their time while they're there.
If you're sought after that highly, then you should make an announcement as well.
I'd be willing to bet "Simply Bloom" wasn't announcing destination sessions with their first destination wedding...but if they were, it's likely demand was that high. Or they just really wanted to vacation that bad and took a stab that someone else might be interested.
I wish I had enough money to do business that way, but on principle I imagined they book a wedding in Europe and then used the rest of the month to continue working there. I thought my idea was along the same lines.
But do they have the first couple cover their costs for the duration of their stay?
I wasn't planning on asking the couple because I do think that's tacky, I was simply figured if the plane ticket costs the same round-trip, how I use my free time is up to me.
In my opinion, if you had figured travel costs into your quoted price...then sure...cost is cost. But if the couple volunteered to cover your travel cost in addition to your quoted price...then that travel paid for is solely for that couple. If you weren't planning on telling the couple of your intentions - I think in a way you're already admitting the idea is in poor taste at best, even to the point of being deceitful.
I appreciate looking at this from all angles, I don't think my idea is wrong from a strictly logical point of view, but from an emotional stand-point if the couple knew it might hurt their feelings for the reasons everyone mentioned. I will give it more thought, thanks everyone!
The way I see it, if producing images is your only concern...then you should do what gives you the best opportunity to do so. If developing relationships with clients is important, then I'd avoid any activity that might sabotage that relationship.