While I will always prefer a physical comic book to a digital one, I've found myself buying the digital versions more frequently. 

Digital comics have some very clear advantages:

Easy storage. Entire collections can be neatly stored. A plus for those who live in smaller homes and don't have as much room to spare.

Pricing. Most of the digital comics I've bought (admittedly, not a huge number) have been lower than the cover price. 

Accessibility. Since local comic shops have dwindled, at least in my area, I now have access to many titles I didn't before (I've given up hope of comics ever returning to the newsstands).

Mobility. Since comics can be stored on my tablet or phone, I can take them anywhere. It's nice to be able to read comics anywhere I go (I've even enjoyed them while waiting in long checkout line!)

It occurred to me that as the digital format gains momentum and becomes more of a mainstream outlet, the print runs on physical comics may dwindle. 

Then I had a frightening thought..

Lower print runs could make a physical comic more scarce, and could very possibly lure back the speculators. 

I figured so many online venues such as eBay and Amazon would be the final nail in the speculation coffin since retailers would have a much harder time hawking those old back issues at hugely inflated prices since they could be so easily found in other markets. 

But if there are fewer physical copies to begin with, there won't be as many to be found on eBay or anywhere else. 

I would love to hear some thoughts on this. Am I being paranoid?

However, I remain 'old school' and will always prefer the physical print.

I feel the same about books/ebooks. I like ebooks for the same reason I like digital comics. But nice leather-bound books are things of beauty and I love the feel of a nice hardback book. 

I have faith that digital and print formats can successfully co-exist. 

I feel the same way Brennan. But I do think that an additional format that would help sustain comics in a digital era and get them into the hands of new readers is ultimately a good thing. Also, comic titles that aren't doing so well sales-wise might have a better chance of being put out since it would cost publishers less to produce (I don't know this for a fact but I can only guess that it would cost less since there would be no ink, paper, staples, separators, etc). 

Don't get me wrong, I'm not really trying to 'sell' anyone on digital comics. They have disadvantages to printed comics to be sure. You are reading something that relies on battery power and a device that could (as JB pointed out) be dropped or could simply "crash" or malfunction. 

But honestly, I love that I can have a virtual library of comics at my fingertips that I can read while on break/lunch at work, or at bus stops, waiting rooms, etc. 

I will continue to buy printed comics as long as they exist. But I only read a handful of titles now, this and the fact that digital versions often cost a bit less, I think I can afford to buy both a printed version and a digital copy. The average price for a digital copy on Kindle or Google Play is around $1.75 - $1.99. Not too bad.