Who wouldn't love something tax free? George Herpin did. He was a French stamp fancier back in the 1860s, when stamps were a fairly new invention. Before stamps, the recipient of a letter—not the sender—had to pay the postage. Stamps forced the sender to foot the bill, and created a lot of stamp lovers among folks on the receiving end of the mail—and a mania for stamp collecting. Timbromania was toyed with as a term to affix to this new hobby—from the French word for stamp, timbre. But when Herpin suggested philatélie (anglicized to philately), combining the Greek root phil-, meaning "loving," with Greek ateleia, meaning "tax-exemption," stamp lovers everywhere took a fancy to it and the name stuck.
French philatélie, from phil- + Greek ateleia tax exemption, from atelēs free from tax, from a- + telos tax; perhaps akin to Greek tlēnai to bear; from the fact that a stamped letter frees the recipient from paying the mailing charges — more at tolerate