Don't listen to these guys they are audio snobs, jk, lol..

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It is an unwise use of money to buy something that does not satisfy, which one later feels the need to replace with something better. Such things are called a "false economy," because they save money up front, but in the long run cost people more. One should buy a sub less good than an SVS only if one never wants one as good as an SVS. Otherwise, much of the money spent on the lesser one will end up being wasted funds.
Many people waste a lot of money with little upgrades, when if they had saved their money, they would either have a better system in the end for the same outlay of money, or will have had the ending system with less money spent. So, one should think very carefully about what one really wants, and about how good it needs to be to be good enough to not need replacing later on.
The irony of this is that the people who most do this are typically people who can least afford it. If one is rich, it does not matter if one wastes money, but if one is rich, one can easily buy something great from the start. If one is relatively poor, one should be careful about managing one's funds to get the best that one can from those limited funds, instead of squandering them. Obviously, each person must decide for himself or herself what is good enough and so forth, but most people tend to regret their choices and keep coming back for advice regarding an upgrade. If they had just saved their money from the start, they would sooner have good gear, and may have better gear than they would otherwise be able to afford.
So, by advising people to save up for an SVS, I am trying to save them some money and some regrets. They are free to accept or reject the advice, as they please.