Also, I do see a temporal pattern in that there's a growing cottage industry of gadgets, apps and even chemistry that has emerged over the past 10-15 years. This mostly has to do with the combination of low barriers to entry for new sellers/producers; you can start selling stuff all over the world without much of an investment, right form your own attic or cellar. Combined with globalization of supply, this has made it possible for private individuals to import bulk chemicals, have electronics manufacturing work performed at low cost for small batches, and many other aspects of industry that used to be reserved for larger business entities.