Unless you plan on broadcasting a flood of messages per day I don't see how this is a problem. If you send a broadcast, an unlimited number of people can receive it and none of the recipients do any PoW to receive. Ditto for chans and decentralized mailing lists.
The use case for Bitmessage is strong anonymity and then censorship resistance. Bitmessage is uncensorable. When you send a message the recipient will receive the message no matter how much attackers try to infiltrate or flood the network.
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