It seems like a voluntary test for someone without symptoms is of limited value to the individual (beyond their individual curiosity) since we don't know enough either way about reinfection risk at this point, and the result is not terribly actionable - you can't just walk into stores without a mask because you have a positive antibody test - nobody is going to trust your lab result printout as a reason to avoid public health measures.

But that said, there should be a public health benefit to broad antibody testing to understand the true infection rate, and for that reason alone, seems like tests like this should be covered by insurance or the public purse for everyone - at least in areas with outbreaks or at high risk for outbreaks.