That's a good point: why are donations of labor not counted as (capped) political contributions? Or are they, and for what contexts? Why those contexts?
If I donate the use of my event center for a campaign rally, that counts toward the limits, but not if I help serve coffee at the rally?
Here's the FEC guidelines:
>The donation of office machines, furniture, supplies--anything of value--is an in-kind contribution. The value of the donated item (the usual and normal charge) counts against the contribution limits. A donation of services is also considered an in-kind contribution. For example, if you pay a consultant's fee or a printing bill for services provided to a campaign, you have made an in-kind contribution in the amount of the payment.
>If you sell an item or service to a committee and ask the committee to pay less than the usual and normal charge, you have also made an in-kind contribution to the committee in the amount of the discount.
>Under limited exceptions in the law, you may provide certain goods and services without making a contribution to the committee. These exceptions are volunteering, travel expenses and business services.
http://www.fec.gov/pages/brochures/citizens.shtml
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Ah well, at least there are SuperPACs...
EDIT: I can think of some arguments to justify no volunteer contribution limits: it's effectively already capped by the amount of labor you can give in total, and is thus inherently limited.