People are sharing their happiness, or they're trolling for gifts, or both. Pregnancy is difficult, uncomfortable, and for many either hard to achieve or hard to survive (literally). Life is about to change a lot, and people usually don't throw a shower for themselves (usually a friend does). Ideally, only good friends likely to share the joy are invited.
You, apparently are blessed with (or plagued by, based on your tone) a large family or a large circle of friends. So you get a lot of invitations.
I think a "sprinkle shower" is less than a full-blown, big-gift shower. It's just for small necessities/niceties and can be a way to pamper the pregnant woman (who is way more tired than she was during the first pregnancy - if you're not a mom, you would have no idea), replace a few things that may have worn out or which just need to be refreshed a bit (like bottles and pacifiers) for a second baby. It lets the person or couple take a few pictures to show both kids later in life, "See, here are the people who love Mommy" (or "Mommy and Daddy" or "Daddy and Papa") and who celebrated that you were on the way. What's so terrible? It's mostly about getting together and laughing and being together, and maybe oohing and aahing over some cute stuff. Not your thing? Don't wish to celebrate a friend's happiness? Don't go.
What's a "same-sex baby"??? It's either twins or the child of a same-sex couple. The first means 2 gifts maybe. The second couldn't possibly make a difference to a decent person - a baby is a baby. And it might be extra nice to celebrate something that some people still frown on and which wasn't a possibility when reproductive technology and marriage equality weren't around.
I don't know what "life ecents ywt" or "living with colon" mean so I can't address those. But if you want to have a party and invite friends to celebrate something, go ahead. Be prepared to pay for it and hope your attitude doesn't come across as a request for gifts, or you'll have no guests. But if you're a good and loyal friend, people should be happy to celebrate whatever you are happy about.
Too many invites? Decline some. Don't make a big deal about hating showers. Just say "So sorry I won't be able to attend. Best wishes." Done.