Spot on. Anyone who thinks both countries are poor must have been travelling both countries blindfolded. Thailand is not a poor country at all, unlike the Philippines, which is very poor. They aren't even close.
The biggest difference is the population and median age. In Thailand, the median age of about 72 million people is just over 40, whereas in the Philippines, the median age of about 116 million is 24. This means that there are a lot more young ladies looking for foreign support. In the Philippines, a man of any age can easily find a 20-year-old without children to marry, whereas, in Thailand, it's mainly the single mothers in the 30-plus age category looking to marry foreigners.
The Filipinos marry foreigners mainly because their (Huge) families are dirt poor. In Thailand, it's single mothers struggling to survive after being abandoned by their husbands. It's a different ball game. In the Philippines, you'll be dating ladies 10 - 20 years younger than in Thailand. Of course, there are exceptions, but this is the general state of affairs.