Multi-Goons gets way more than 30 VP tokens.
It can, if your opponent doesn't know what you're doing, or the game is so close that you don't have time to three-pile. Multi-Goons in general gives ridiculously many VP tokens. 15 isn't unreasonable over the whole game, but you shouldn't have 15 coin tokens in your pile at any time. I did in fact give a baseline for how many I think is sensible.
Sometimes multi-Goons is possible; sometimes multi-Merchant Guild is. Sometimes a Golden Deck is fast enough, sometimes Scrying Pool/Candlestick Maker is. Of course there are some games where you can win on VP chips alone, and then there are games where it
is sensible to build your entire economy out of coin tokens. But you see Baker and Chapel and think, I'm going to Chapel down and just play a lot of Bakers every turn and buy all the Provinces in one go - but then once you have all those coin tokens you can't buy Provinces because your opponent already has four and you'd end the game with a loss. Normally it's a bad plan, even if it's an exciting one - it's about equivalent to "hey, Bishop is on the board, that means I don't have to buy Victory cards!"
If the phrase "ridiculously many" conjures up for you images of Scrooge McDuck swimming amongst the gold coins in his vault, or you're allergic to hyperbole/flowery language, read "ridiculously many" as "too many", or "more than you should have". It's just a tautology, coin tokens are better than VP chips unless you have more coin tokens than you can sustainably spend at >=1VP per token. But it's not a vacuous truth, as in the next section I demonstrated that the quantities of VP chips produced in a typical game are also sensible quantities of coin tokens in a typical game.
Regarding how many tokens you get per shuffle, that's not really a fair comparison, unless comparing the strength of the official cards rather than just the tokens. All of the VP token cards are terminal, most of the coin token cards are not.
It's a much better comparison than how many you have at a particular time, or how many you collect throughout the game; it directly tells you how many coin token producers you want in your deck. It is also much easier to estimate how many you would need, because on average, you're going to see each of your cards once per shuffle.
Just because something is non-terminal doesn't mean playing five of them is five times as good as playing one. You can spam Market Squares too, but that doesn't make it a good idea. Yes, it's easier to get coin tokens en masse than VP tokens, because there are non-terminal coin token producers - but that isn't a reason to do it, you have to decide how many coin tokens you will want before more stop being useful to you, and add the appropriate number of coin token producers to your deck, not just blindly buy as many of them as possible.