Marketing is a highly beneficial activity, as long as you are using it to its full advantage. There is no point spending more on your marketing than it is going to make for you. The point of marketing is to capitalise on your spend and ultimately, make more money.
One way of ensuring you are making enough money on your marketing is to cap your marketing spend. When you make your plans, ensure that you aren’t too overly generous with the money you give yourself to spend on advertising and marketing. It should be enough to cover the marketing activities you want to carry out, without putting yourself under pressure.
You must also be careful to monitor the amount of money you make via your marketing efforts. If it is not making enough revenue, the answer isn’t necessarily to spend more. Spend more wisely instead and see where this gets you.