If you’ve ever wondered whether a single welcome bonus offer can unlock a first class experience, the answer is yes, at least with Amex Membership Rewards.The Platinum Card® from American Express is currently offering a massive welcome bonus as high as 175,000 points:Apply and find out if you're eligible for as high as 175,000 points after spending $8,000 in eligible purchases in the first 6 months. Welcome offers vary and you may not be eligible for an offer.This huge haul of points can go further than mos ...