Baby shower thank you cards

Okay ladies, I’d like some honest but polite opinions on thank you cards. I personally don’t need a thank you card from a bride or a mom-to-be for a gift I’ve given but I always appreciate the time they took to write it. However, unless there is a photo on the card, I never keep them. So my shower is looking like it’s going to be WAAYYYYY bigger than expected with over 100 guests. So if you were a guest of a shower that large and you received a thank you card with a prewritten message on it, would you be offended? I would hand write their name on each card and if they are a person I know would expect a hand written note I would add it to the card. But otherwise, I’d like to have them preprinted with a message of gratitude. What are your thoughts?