I do as @uladz does and it results in quite a bit of sales. But I use the eBay website since managing the quantity of offers sent in GS just doesn’t work [as this post shows]. You can bulk send via the eBay app and eBay website which works well for me.
I do not have Best Offer enabled on my listings so the only way one has to get a better deal is for me to be proactive. For some of my items, I build that in, knowing I will accept X % less and send offers to would be buyers. The buyer feels like they’re getting a special deal and nabs it. For some of the categories I sell in, doing this will result in 75% of the time the item selling at either the offered price or the asking price [because eBay will let folks who have viewed the item know that offers have been sent to others and they may want to buy the item now before it disappears].
Using Safari’s Profile feature, I use a 2nd eBay account do do my browsing/research of items so that way offers and such go to that account which I never monitor. And when I buy an item, 99% of the time, I use my personal account so that way if I have a serious enough issue with the purchase that I leave negative feedback [it takes a lot to get to that point], someone can’t be vindictive and buy something from my biz account for the purpose of leaving negative feedback. Having multiple eBay accounts is allowed and if you sell a lot, it is highly recommended so you aren’t “spammed” by eBay with offers from other sellers on things you have researched prices on.
Going back to the issue at hand, I played around with using the send offer feature in GS but in the end abandoned it because it had no way to do that in bulk, but eBay offers that feature on their website, so I just use it there. 