I would expect those who can't make the ceremony to not use the excuse "we have no money" in regard to attending a wedding reception
But you have made it clear you are not inviting them to a wedding reception, but to an evening reception with drink, snacks, drink and a buffet. Now, once again that is what you have chosen and that is perfectly fine for you and your intended.
However, perhaps your friends are sad because they will get no opportunity to actually talk to you properly, to see you as a bride in your wedding dress? (I'm presuming you will change after the ceremony and won't be going around the city all day in your wedding dress? Forgive me if am wrong)
Your OP spoke about "many of my friends" - now, either they are all in league against you OR your plans for your wedding simply don't suit them. Which do you think it is?
You've got two choices: keep the wedding you want and allow your invited guests to decide whether or not to attend and do not hold non-acceptance against them. This seems unlikely, given your reactions on this thread, but never say never.
Or to change your plans. I don't think you should do this, if you are happy with the arrangements as you say you are. But of course it is your choice.
Anyway, whatever you decide, I hope you and your guests all have a lovely day.