Thinking of implementing pre booking enquiries limit - opinion pls

I am helping my husband to operate a vacation photography service catering mainly to overseas clients who come to our city in Japan. We do everything from individual shoots to surprise proposal and engagement shoots for clients who want to commemorate their moments in picturesque places here.

We’ve been doing this for nearly a decade, but found that increasingly, even as we raise price (priced in USD as most of our clients are Americans/ compare us with photo platforms priced in USD), we are fielding more inquiries from lower quality people.

The worst are people looking for recommendations for proposal spots, who ask us for specific spots recommendations and then ghosting us when it comes to payment. We suspect many of them were just fishing for recommendations without actually intending through to book in the first place. Obviously we try not to give specific spots or discussing all details without retainer payment paid first, but they keep fishing by saying that they’re not comfortable booking ‘once in a lifetime event’ without the exact spot nailed down.

As such, we are now thinking of implementing a limit on pre-booking inquiries to 3 correspondence (three messages from them, three from us) which in theory give them the chance to ask any important questions they need to make the decision on whether to engage us or not, but limit our loss in terms of time wasted on low quality leads. However as I have never seen similar policy being done by any other photographer, I am worried that this may put people off from enquiring in the first place.

My questions:

1. Has anyone done something similar? If so, how does it impact on the overall volume and lead conversion?

2. As a potential client, how would you feel if you see a photographer you’re interested in implementing this policy? Would this deter you from using their services?

3. Any other recommendations on how to limit communication on potentially troublesome clients who are unlikely to book without telling them off?

Thanks in advance