I often buy points from co-workers, so you could argue that I have both a reasonable market price and an investment in my points.

Nonetheless, I would not think of including them in net worth. Remember that if you do, you now have to reduce net worth every time you make a redemption.

Do you include your television and laptop in your net worth? Do you depreciate them every month?

Further, if you want to value your points, are you going to use mark-to-market or mark-to-model? Mark-to-market means valuing them at what they could be liquidated for under present market conditions, meaning probably, what you could get for them in 48 hours if you sold them on Craigslist. Mark-to-model means their actual value in redemptions assuming you can hold onto them long enough to use them in an orderly way.

If your points represent more than a trivial portion of your net worth, then you need to start worrying about your net worth or set of priorities.

Now, if you are regularly selling the points, or using them in a way to generate income (for example, you are self-employed and use them for business trips), or they have some other clear monetary value, my opinion might be different.