You can share the match link on the forum to get users to buy tickets but it will never be like selling them through credits because selling through credits allows you to get tickets to those who have never bought them for your matches and therefore grants you a bigger boost in popularity than someone who usually takes them. This in my view, as mentioned earlier, is an important part of the V.I.P.
In addition to this, by paying with credits, you cannot sell them because the sponsorship appears only to those who have not bought tickets from you up to that moment. So if all active users have already bought tickets at least once, you spend the credits and nobody gets them.
That said, in my opinion it's a problem that can be easily solved by doing a reset every 3-4-5 seasons (I'll give random examples).