No…indesign doesn't know how to export inline graphics properly into epub (something adobe is still working on). epub does know how to handle them. It's a translation error, not a format error.
Adobe has changed to a subscription format for it's creative suite products. So why just not use it? The problem is, other products are very inferior and for someone who has grown up with Photoshop products, having to get used to some other clunky UI can be quite frustrating. If you're thinking of getting photoshop, check out these best laptops for adobe photoshop. There are a few ways to still buy Adobe Photoshop CS6 without subscribing to the creative cloud subscription service. One of the most common options is to use Ebay and purchase someone's copy.