Explain your point mate, we can compare our ideas.
As you have said without knowing the actual keyword we arnt able to give an accurate answer but this is what im going by.....
Firstly, the OP said eBay is ranking in the top SERPs. I have read in a few different places that if ebay/amazon/youtube are ranking for a keyword then thats a good thing because they will be easy to over take. I am not saying this is the reason the OP posted the top ranking sites but I have made a fair bit from ranking ebay pages for buying keywords and dropshipping stuff. It would be extremely hard for someone new to IM to over take my pages.
Secondly looking at the DA/PA split for the SERPs, usually I wouldent want to see more than two over 30, for this particular keyword that is almost the opposite of whats happening. I know there is a PA N/A but it has a DA of 96 so its DA can carry it.
Thirdly the backlink split screen shot that is linked from MOZ is a terrible indicator in my opinion, as far as backlink crawlers go I feel moz has the worst one out of moz, AHrefs and Majestic meaning it missed many links anyway. In addition to this there are plenty of little magic tricks we can do as SEOs to mask the real strength of a keyword. Take the top result for example, moz is showing one backlink. Even if this is true and it is resting on only one backlink it could be an extremly strong backlink. For example a high DA/PA site that is trusted by google, that page could then have thousands of decent links pointing to that filtering the total power to the page in question.
This next one is total speculation as I have not used MOZ and am unfamiliar with its percentage system but something ranked 30%-50% to me would be hard to rank.....out of 100% moz are telling you its already half way to 100% (also known as dont waste your time).]
Finally there is the fact the OP is having to come here and ask if his keywords are easy to rank. An indicator that he is not very experienced and may lack the tools and more importantly the knowledge to rank any keyword never mind these ones.
@ OP, please dont feel any of this is aimed at you in a negative way. Please take it as something to build on. The first keyword I tried to rank for was a 90,000 per month search term with around 3 million quoted competing pages. All of this because traffic travis told me it was rankable.