Oh, come on!
Your neighbour might want to consider the wanton waste of millions of otherwise perfectly useful DSLRs traded up for the next best thing in "upgrade(s)" "for better pictures". I am profoundly amazed by the hundreds I see being traded in almost on a daily basis to keep the industry cogs going over (at the expense of analogue). Each DSLR uses a huge number of precious metals: gold, nickel, silver, cadmium... plus the industry-intensive business of plastic manufacture and moulding. It is not cheap. Not environmentally sound and there is the problem of a chain of waste that nobody seems willing to tackle, unlike recycling mobile phones that is commonplace. The neighbour is misinformed and obviously "carried away" with the benefits and "environmental soundness" of digital, but he is in a rut for sure if he has to continually buy a new PC (another source of waste — how many PCs can you count have actually been recycled?), especially with 30,000 images. LOL. OMG! What does he do with them? I print and frame virtually every one of my images. What does he do with his? Tell me! I take the view he has intellectual waste on a grand scale. Bide him a good day, and be entertained by his naivity, then go back to enjoy doing what you do so well.