The meaning of "がい" in 落としがい


First of all, I want to say that I'm not even sure if "がい" comes together, or
if they're separated into が+い (which doesn't seem like the case...?)

While I've heard that がい is a stronger version of が, I'm not sure if that's
how it's supposed to be interpreted in the following sentence:

> それに 落としがいもありそうだ




I think a little more context for that sentence would help, but basically this
is the noun 落とし followed by a form of the phrase ～甲斐{かい}がある, which means 'be
worthwhile'. It's an N2 grammar point (see
[here](https://j-nihongo.com/kaigaaru/)). The かい part often becomes がい due to
rendaku. That is why it is がい in おとしがい.

As for 落とし, one meaning is 'getting someone to like you romantically'. I'm
assuming this sentence is something to do with a relationship. If so,
落としがいもありそうだ would mean something like "It seems like it would be worthwhile if
that person fell in love with me". Again, this interpretation might be
different if the context is different. But the point remains that the phrase
is a combination of the noun 落とし with a form of the phrase 甲斐がる (with
rendaku).

The phrase is mentioned in
[this](https://www.excite.co.jp/news/article/Ren_ai_134463/?p=2) article about
things about girls which make guys think it wouldn't be worthwhile to be in a
relationship with that girl. The point of the article is
男が「落としがいがないな」と思う女の特徴4つ.

