Under U.S. law, this is only actionable is you make this statement knowing that it would not "support the continued creation of X" and that instead, you had already completely abandoned that product and you were, for example, planning to change lines of work and become a lumberjack instead.
Even in that case, common law fraud is hard to show, because you would need to show how that statement which related to how the profits will be used, rather than what you are actually receiving, could cause you damages in that narrow transaction.
But, many states have deceptive trade practices acts that protect consumers by allowing the attorney general, local prosecutor, or a private individual or class of plaintiffs to sue if representations such as these are made when they are known to be false. Typically, these lawsuits provide for minimum statutory damages, attorneys' fees award, and when cases are brought by a public official, injunctive relief (ordering the advertising with that pitch to cease) are authorized. For example, saying this when it is false would be actionable in California and Colorado.
A fairly common fact pattern is that someone will sell stuff at an above market price saying that "profits will help me pay for my cancer treatments" when in fact the person doesn't have cancer. This could even constitute criminal wire and mail fraud, for example.
Sometimes, competitors can also sue you under the Lanham Act (which primarily governs federal trademarks), for false advertising about something that could unfairly undermine their sales if what you are saying isn't true and is causing their sales to drop.
On the other hand, if you sincerely believe that what you are saying is true when you say it, and your belief is not so unreasonable that no reasonable person could believe that under the circumstances, then what you are saying is legal. Usually this is true, and if it is, ultimately, you will be fine. Although nothing can prevent you from being sued on a non-meritorious basis.
In between are cases where this is true (you will be supported, but perhaps only get 5% of the profits while the rest are garnished for a lawsuit), but your statements were still misleading at the time you made them and you knew it. Those cases get resolved on a case by case basis.
Outside U.S. law, your mileage may vary. Legal regulation of commercial speech varies significantly from one country to another. These statements might not be O.K. for example in a Communist regime on the Chinese or Korean model.
