Discussing this with friends..
I get the idea that it's nice to exchange but I don't feel bad when people deliver a mishloach manot and I have nothing to give them in return.
I always say thank you, comment on their generosity, shmooze and wish them a happy Purim and I honestly don't think either of us walks away feeling akward or bad.
Others were saying how they have to give to all their neighbors, people in the community and make sure to have enough for everyone who may bring them.
Seems like so much pressure and so insincere.