Most state laws forbid anything like this. Here’s California’s relevant election statute:
18521. A person shall not directly or through any other person
receive, agree, or contract for, before, during or after an election,
any money, gift, loan, or other valuable consideration, office,
place, or employment for himself or any other person because he or
any other person:
(a) Voted, agreed to vote, refrained from voting, or agreed to
refrain from voting for any particular person or measure.
(b) Remained away from the polls.
(c) Refrained or agreed to refrain from voting.
(d) Induced any other person to:
(1) Remain away from the polls.
(2) Refrain from voting.
(3) Vote or refrain from voting for any particular person or
measure.
http://www.leginfo.ca.gov/cgi-bin/displaycode?section=elec&group=18001-19000&file=18520-18524
Maybe a “business” can do this while a “person” can’t, and there is the matter of what is “valuable consideration”.
The vote was merely contingent upon voting, unrelated to any particular person or measure. I can't see how the statute would apply.