I am pretty sure there is a mention that just holding The Power is a good protection from all but the most powerful Compulsions. Maybe channeling also has a good chance of removing a compulsion. Another possible reason: High-level Compulsion are only used by the Forsaken, for them the power boost from linking with an average third-age channeler would not be worth the effort.With an (s)angreal the power is all yours, all the time. I is easy to use, and can easily be carried around, often even hidden on your person. That is much better than depending on the goodwill of others and setting up complicated rituals.We do see both men and women Aes Sedai / Ashaman / Forsaken seeking out angreal and sanangreal to enhance their power, but with the women channelers it is so easy to create a link with another women, and you can then force yourself to be in control of the link if you are dirty and limit the abilities of the other women.
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Sorry, I genuinely quoted the wrong post. I wanted to reply to (and have fixed the quote):