I did it in the past and regretted it, even though my only source of income is signature campaigns. It's just that sometimes you can't stop the thoughts from circling around your head. I generally didn't bother to even look at it's price, but I've recently started feeling a little wearied. Perhaps it has to do with the life-induced stress that I've discussed in a previous thread. Who knows? How do you cope with waiting?
The main reason why you end up regretting your investment in the past is a lack of patience. If you are patient enough, you can still manage the money that you receive from the signature campaign. If I am not mistaken, you are paid weekly in the signature campaign. The money that is given to you every week can be managed up to next week before you receive another payment, which means you will be budgeting your expenses based on your income that comes to you weekly.
And again, if you have another source of income, you will enjoy your investment better because, when you invest, you should forget about the money and put it at the front of your mind, not at the back of your mind. The money you invested is like you borrowed it from someone and will bring it back after a long period of time with profit.For instance, in banks, we have what is called a fixed deposit account. When you want to put money in this account, you will make an agreement that this money will not be withdrawn no matter the condition until the year of agreement is reached, which is when you will receive your profit and your capital at the same time. So you can use that method to yourself and promise yourself that you will not withdraw the money until after some years and keep to your promise. With that, I think you are good to go.