Buy only what you really need (software and/or courses that are 100% relevant to your current situation and can help you build your business)
Do NOT buy any wso on its launch day, no matter how glorious endorsements you are getting in your inbox, no matter how many raving testimonials you see in the thread.
Subscribe to wso threads that caught your attention and WAIT!
Monitor those wso threads (read emails with new posts) for a minimum of 3 days. If there are no signs at all that the product could be a half-crap/crap (or problematic in any way), chances are that it is a good product and it's safe to buy it. I know that sometimes it's very tempting to buy that 'shiny object' straight away, but trust me, this will save you a lot of unnecessary hassle.
In the meantime, check the wso seller's history. Allways do that. Take a closer look at seller's previous wsos and even other threads and posts.
Do NOT care about price increase (dime sales) and early beard bonuses.
You want to buy a good, useful product that can help you build your business, right? Look, even if you pay the maximum price for an excellent product, you WIN! On the other hand, if you pay lowest price and get a crappy product...you lose! What option do you think is better for you?
If you are extremely happy with your purchase subscribe to be notified on future wsos from that seller.