Not at all under the circumstances. Not at all.
If you had been in good financial position and taking a major honeymoon the next day then maybe. But under the circumstances you did what you had to do and I cannot imagine anyone not understanding.
The way you word things goes a long way too... It would be tacky if people showed up for lunch after the wedding or at the millenium party and weren't told in advance that they would have to pay for thier own. But it sounds like you told people in advance so they knew and were prepared.
Nothing tacky here.