I checked out your forum and do you have plans to increase your rates per shares? For sure that will boost your traffic.
And if that happen new members will be automatically come to your forum, well good luck to your forum congrats for doing great for the past two months!
Thank you mega_carnation for your kind words! The rate per share is determined by our revenues and activity. The more revenue we have, the higher the rate per share will be. The lower the activity is (sadly), the higher the rate will be. However without activity, our revenue will not be very high. So the more members with have, the higher the rate per post will be.

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It is your initial stage and in that stage if you will rely on the income from the site then it may not be able to support itself but you have to manage for some funds from your pocket. If you will give some money for the members to remain active then they will spend more time on your forum and slowly your members will increase in quantity after that your site will be able to bring a huge profit and the members will be happy with the revenue shares.