Based on later comments I want to add the following to my reasoning for not supporting this at all.
1. Yeah for some people posting an ad for kicks and giggles may be enough reason to spend money, but I highly doubt that this group is enough to create a high and steady enough stream of income for Lorwolf in comparison with 3rd party ads. This might cause them to (re)introduce more p2w elements in order to make up for the income lost, and that would not be a welcome change
2. if people are using the ads to advertise their ingame shops or art, it'd make it very p2w. People who have money to spend can buy ads, make themselves more visible, get more sales through it and get richer in the process. That is highly unfair to people who are underage and/or don't have money to spare to buy the ads.
If you want to support the site, disable adblock, buy moonstones or buy a subscription. If you want to share silly things for kicks and giggles, do so on the forum. I see no need to implement this, and only downsides if they do.