I found it very difficult to get submissions for my ethnic niche TGP when I started and did not want to just back fill with sponsor galls.
Another webmaster I know started a promoting a generic TGP at the same time I started promoting my ethnic TGP and he now gets about 100 sub an hour. I get about 30 a day and it has been hard work building up to that.
One of the things that I have not done that probably would have lifted both traffic and submission (through general awareness) is traffic trades. I am only interested in static link exchanges and don’t care about traffic quantity. Most TGP’s are playing the numbers game and use scripts (that don’t help PR and Keyword relevance) for exchanges. Most also seem to employ skimming which I will not do. As far as I can see skimming is used to boost traffic trades by many. My focus is on SE traffic rather than huge leech TGP traffic.
So I am probably not playing the TGP games properly according to convention. If you participate in script based traffic trades and maybe buy some traffic to start off with you can probably give you niche specific TGP the kick start it needs. I may even do this myself in the futre.
That other TPG getting 100 subs an hour does not traffic trade either but does accept and list just about anything - his TGP is
www.qtts.net
My ethnic TGP is
www.honeybabes.net