www.elitefourum.com/t/weighing-packs-frowned-upon-or-no/25566/1
I think your best bet are the two resources above (Smpratte’s awesome take on the subject as well as a discussion which happened here on E4not too long ago about the subject) which is where youll find a lot of great input, including my own on the matter. To quickly sum up my thoughts though (if thats even possible, as i tend to type/talk a lot haha) I side with Smpratte and many others on how today weighing packs sadly is the only way to go. I am not at all in favor of this practice, nor do i think anyone in the hobby is as it infringes on that mystery and love for opening boosters, but today being that these older WOTC cards have now been around 20+ its right to just assume that all packs have been weighed, as many have changed hands over the years, been bought and sold to make profit, and weve had consistent efforts through resellers and scammers to attempt to make the highest dollar amount while screwing over buyers being that Pokemon as a whole is now entering (or has already been for that matter) a realm of establishment that wasnt before present among the card collecting communities. Thus, the practice of weighing packs now is more of a safety matter than anything, but also will allow for insured sales so that all parties involved in the selling of unopened items are secure throughout.
Im sure I decribed this better in my first post about it, but this is the main idea I had in a nutshell, which many others agree. A few bad apples can turn a whole sea of a hobby sour, and pretty much thats the reasoning behind all this, but at this point in order to keep moving forward, this (weighing) is really the best option we have to continue onward. Anyways, hope this helps!