Hi! Well, this is a complicated answer, but I will do my best to help you out.
Yes, Mikimoto can get very expensive. Of course, there are lower priced pieces, but for a fine strand, it's can get into serious money.
Is it worth it to me? Absolutely. I am sure you know by now I am a huge fan, and for pearls, I only buy Mikimoto.
I would say if you are looking for brand recognition on jewelry and want people to recognize it when you wear it, Mikimoto is not it. It is the most understated, no one really knows you are wearing Mikimoto. For some people, they will only spend big money on something that is brand recognizable. It's all preference.
So then why do I buy Mikimoto? I love pearls, and I buy Mikimoto because their pearls are amazing and top quality. Their akoya pearls glow like no other, they are like glass. Yes, I am sure one can go to a pearl dealer and get similar no name pearls, but for me, I also want the Mikimoto name as they are the reference. No one knows when I wear my pieces, and I never say anything. Jewelry is personal. I know, and that matters to me.
What I would recommend is you go to a store that carries Mikimoto.. The best would be if you can go to a Mikimoto boutique. Look at the strands and see their glow. Look at different sizes of the pearls, small and large. Akoya pearls will get exponentially expensive after 8.5mm becuse those large sizes are very rare. Ask to see large ones if you they hae it, the largest akoya is typically 9mm-9.5mm. There will only be a few of those strands due to its rarity. The price of those will be very high, some near $100K for a strand. I am not suggesting you look at these to buy. I am suggesting you look at these to see and understand akoya pearls and Mikimoto. Once you see the beauty, the glow, the perfection of each pearl, you will know if it's worth it to you, or not. Pearls are the only gemstone that is not shaped by man to create it's beauty. It comes out of the oyster shell as-is, you are seeing near perfection in nature. A Mikimoto strand is fully matched, super perfection. If you like what you see, now you know what to look for. Then look at sizes you like and your price point. The smaller pearls will glow just the same; they are just as beautiful. Seeing the larger size pearls helps to see the full beauty of a single pearl.
On your necklace, I think that necklace is very creative as you can also wear it as a bracelet. While creative, I think you will tire of it after a while. For me, I like classic pearl strands, and I wear them with everything... from shorts to suits. I would suggest you look at a single or double strand without the buckle. I think it is is more classic and more lasting.
You may also want to try on some earrings, maybe some simple studs. I think you may like them. I think pearls light up your face and make it glow. For me, if I could only keep one piece of jewelry, it would be one of my long Mikimoto strands.
I hope you can get to a store and look at the some pieces. You can then decide if Mikimoto is worth it to you, and if you want to start collecting.
I hope this was helpful. Good luck to you, and I hope you fall in love with Mikimoto.