Even though the Titan Giant Ape Clan was extremely powerful, they were not rich. They did not have any special methods that could be used to bring in a regular income, so they could only rely on continuous accumulation.
In modern society, the status and influence of the soul masters were no longer as great as they had been in ancient times. Soul technology had solved the vast majority of problems while mechas were not exclusive to soul masters anymore. Ordinary people could also become mecha masters with the proper training.
Moreover, the Titan Giant Ape's lineage firmly stood by their honor and refused to be used by others. As a result, the clan was not wealthy.
Even though the clan had cultivated clansmen with various sub-professions, the thought of cultivating a Saint Craftsman had not occurred to them.