It is not at all appreciated by forum DT members or moderators. You have to analyze the project perfectly when you want to invest on it that time you can make the post their thread as a review but unnecessary bump on the ICO thread will not do when someone requesting to you for the payment.
I noticed many people got negative trust from the DT guys who are involved in the bump group for the ICO thread bump. However, to get you can apply to the signature campaign to get paid in BTC.